Klassifikationsnummer
- P - Language and Literature 23 results
- Q - Science 23 results
- S - Agriculture 23 results
- D - World History 13 results
- H - Social Science 9 results
- G - Geography, Anthropology, Recreation 6 results
- N - Fine Arts 5 results
- A - General Works 4 results
- B - Philosophy, Psychology, Religion 4 results
- T - Technology 4 results
- C - Historical Sciences 2 results
- R - Medicine 2 results
- K - Law 1 results
- L - Education 1 results
- Z - Library Science 1 results